A NASA astronaut says aliens haven't visited Earth yet because they are "perfectly happy to stay home."
Stan Love, 57, has shared his thoughts on alien intelligence and believes they haven't come to explore humans just yet.
The American scientist first joined Nasa in 1998 and has recorded more than 300 hours in space.
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But despite the long hours he has dedicated to research, he has never spotted any indications of intelligent life on Earth.
Love, who went on his first spaceflight on Space Shuttle Atlantis in 2008, says that maybe intelligent aliens aren't interested in exploring.
He told The U.S. Sun: "You could imagine intelligent life that just doesn’t care about technology and is just perfectly happy to stay home and doesn’t feel like they need to build starships."
Love believes there could be intelligent creatures out there who are unable to or don't want to say hello.
He said: "You could imagine intelligent life that we wouldn’t even recognise as intelligent like imagine coral reefs that are complicated enough to each be at their own intellect and they speak to each other through coded pulses of fish larvae and sea urchin eggs and we would have no idea.
"Dolphins on Earth are pretty smart, we can’t communicate with them, we can’t relate."
Love highlighted that alien intelligences could be "more common than we think" but because they are different from us we haven't realised.
He shared his insight that the intelligent alien life could have been obliterated somewhere in the universe before it managed to reach us.
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Love added: "I see in reputable sources, they talk about a great filter, something that stops technical civilizations from developing to the point when they can master interstellar travel.
"What that might be is you poison yourself with your own waste, you cook yourself by altering the composition of your atmosphere because you think it will make you rich to do that or you blow each other up with really powerful weapons."
His final theory suggested that aliens could be smarter than us which may be why they haven't taken the time to visit.
Love explained: "A civilization that can master that kind of energy probably has nothing to do with us. We would be interesting scientifically I imagine. It’s a subject of a lot of debate."
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